Fatally
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C1 adverb /ˈfeɪ.təl.i/

Fatally

fatalmente
Meaning
in a way that causes death; with deadly consequences; critically
Example
The accident fatally injured two passengers.
El accidente hirió fatalmente a dos pasajeros.
C1 noun /ˈfɔːrdʒəri/

forgery

falsificación
Meaning
the crime of making fake documents, money, or artworks
Example
The bank detected a forgery in the signature on the cheque.
El banco detectó una falsificación en la firma del cheque.
C1 adjective /ˈflʌstərd/

flustered

desconcertado
Meaning
in a state of confusion or agitation
Example
She appeared flustered after being asked so many questions.
Ella parecía desconcertada después de tantas preguntas.
C1 noun /ˈfʊtˌnoʊt/

foot-note

nota al pie
Meaning
A note of reference, explanation, or comment placed at the bottom of a page.
Example
The author included a foot-note to explain the historical context.
El autor incluyó una nota al pie para explicar el contexto histórico.
C1 verb /flɪntʃ/

flinch

retroceder
Meaning
to suddenly move back or away due to fear or pain
Example
He didn’t flinch when the doctor gave him the injection.
Él no se echó atrás cuando el doctor le dio la inyección.
C1 adjective /frəˈnɛtɪk/

frenetic

frenético
Meaning
Fast and energetic in a wild or uncontrolled way.
Example
The stock market experienced frenetic trading after the announcement.
El mercado de valores experimentó un comercio frenético después del anuncio.
C1 verb /fɔːrˈʃædoʊ/

foreshadow

presagiar
Meaning
To indicate or suggest something that will happen in the future
Example
Dark clouds foreshadowed an approaching storm.
Las nubes oscuras presagiaron una tormenta inminente.
C1 adjective /ˈfɔːrmətɪv/

formative

formativo
Meaning
Having a lasting influence on a person's development or character.
Example
Childhood is often described as a formative stage in life.
La infancia a menudo se describe como una etapa formativa en la vida.
C1 noun /ˈfæm.ɪn/

Famine

hambruna
Meaning
extreme scarcity of food; a period when food is extremely scarce
Example
The severe drought led to widespread famine in the region.
La grave sequía provocó una hambruna generalizada en la región.
C1 verb /ˈfɔːlsɪfaɪ/

falsify

falsificar
Meaning
to make something false or to misrepresent
Example
He tried to falsify the documents to avoid taxes.
Él trató de falsificar los documentos para evitar impuestos.
C1 verb /ˈfʌmbəl/

fumble

torpeza
Meaning
to handle something clumsily or to make mistakes while doing something
Example
He fumbled with the keys and dropped them on the floor.
Él torpedeó con las llaves y las dejó caer al suelo.
C1 adjective /frəˈtɜːrnəl/

fraternal

fraternal
Meaning
Relating to brothers or brotherhood; friendly and supportive.
Example
The two nations maintain a fraternal relationship.
Las dos naciones mantienen una relación fraternal.
C1 noun ˈfɜːr.vɚ

fervor

pasión o entusiasmo
Meaning
Strong passion or enthusiasm for something.
Example
He spoke with great fervor about his vision for the company.
Habló con gran fervor sobre su visión para la empresa.
C1 verb /ˈfɜːr.tɪ.laɪz/

fertilize

fertilizar
Meaning
to make soil or land more fertile by adding substances
Example
Farmers fertilize the fields to increase crop yield.
Los agricultores fertilizan los campos para aumentar la cosecha.
C1 noun /ˈfjʊərɔːr/

furor

alboroto
Meaning
An outbreak of public anger or excitement.
Example
The politician's remarks created a furor in the media.
Los comentarios del político crearon un furor en los medios.
C1 adjective /ˌfɑːrˈfetʃt/

farfetched

improbable o poco probable
Meaning
unlikely to happen or be true; improbable
Example
His explanation for being late sounded farfetched.
Su explicación para llegar tarde sonaba inverosímil.
C1 noun /foʊ/

foe

enemigo
Meaning
an enemy or opponent
Example
The knight fought bravely against his foe.
El caballero luchó valientemente contra su enemigo.
C1 adjective /ˈfuːlpruːf/

foolproof

a prueba de tontos
Meaning
Designed to be very easy to use or understand, leaving no possibility of failure or error.
Example
The new software has a foolproof installation process.
El nuevo software tiene un proceso de instalación a prueba de tontos.
C1 verb /fɔːrˈɡoʊ/

forego

renunciar
Meaning
to decide not to do or have something pleasant or valuable
Example
She decided to forego dessert to maintain her diet.
Ella decidió renunciar al postre para mantener su dieta.
C1 noun /fɪkˈseɪ.ʃən/

fixation

fijación o interés obsesivo en algo o alguien
Meaning
An obsessive interest in or feeling about someone or something.
Example
His fixation on perfectionism delayed project completion.
Su fijación con el perfeccionismo retrasó la finalización del proyecto.
C1 adjective /ˈfɑːð.ər.ləs/

fatherless

huérfano de padre
Meaning
without a father
Example
The fatherless child relied on the support of his community.
El niño huérfano de padre dependía del apoyo de su comunidad.
C1 noun /ˈfæs.ɪt/

facet

faceta, aspecto, parte
Meaning
One of the many aspects or features of something; a particular part or element of something.
Example
Every facet of the project was carefully analyzed.
Cada faceta del proyecto fue cuidadosamente analizada.
C1 noun /ˈfaɪər.wɔːl/

firewall

cortafuegos
Meaning
A network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.
Example
A firewall protects networks from cyber-attacks.
Un cortafuegos protege las redes de ciberataques.
C1 verb /fret/

fret

preocuparse
Meaning
to worry or be anxious; to be troubled
Example
Don't fret about the exam results.
No te preocupes por los resultados del examen.
C1 noun /ˈfæk.ʃən/

Faction

facción
Meaning
a small organized dissenting group within a larger one
Example
Different factions within the party disagreed about the new policy.
Diferentes facciones dentro del partido no estuvieron de acuerdo sobre la nueva política.
C1 adjective /flæmˈbɔɪənt/

flamboyant

llamativo, colorido o confiado
Meaning
showy, strikingly bold or colorful; confident and lively
Example
His flamboyant style drew everyone's attention at the party.
Su estilo llamativo atrajo la atención de todos en la fiesta.
C1 noun /ˈfjuː.tʃə.rɪst/

futurist

futurista
Meaning
A person who studies or predicts the future, especially trends in science, technology, or society.
Example
The futurist predicted major changes in transportation within the next decade.
El futurista predijo grandes cambios en el transporte dentro de la próxima década.
C1 noun /fruːˈɡæl.ə.ti/

frugality

frugalidad
Meaning
The quality of being economical in use or expenditure; not wasteful.
Example
Frugality is essential for saving money effectively.
La frugalidad es esencial para ahorrar dinero de manera efectiva.
C1 adverb /ˈfɜː.vənt.li/

Fervently

con fervor; ardientemente;
Meaning
with passionate intensity; ardently; with great emotion or enthusiasm
Example
She fervently hoped that her dreams would come true.
Ella esperaba fervientemente que sus sueños se hicieran realidad.
C1 noun /ˈfoʊk.lɔːr/

folk-lore

folklore
Meaning
The traditional beliefs, customs, stories, songs, and practices of a community, passed down through generations.
Example
Bangladeshi folk-lore is rich with myths and legends.
El folklore mexicano está lleno de mitos y leyendas.
C1 verb /fɔːrˈkloʊz/

foreclose

embargar
Meaning
to take possession of a property due to the owner's failure to keep up mortgage payments
Example
The bank decided to foreclose on the property after months of missed payments.
El banco decidió embargar la propiedad después de meses de pagos perdidos.
C1 noun /ˈfɔːrˌrʌnər/

forerunner

precursor
Meaning
A person or thing that comes before another; a predecessor or harbinger.
Example
The Wright brothers were the forerunners of modern aviation.
Los hermanos Wright fueron los precursores de la aviación moderna.
C1 noun /ˈfɔːrˌθɔːt/

forethought

previsión
Meaning
careful consideration of what will be necessary or may happen in the future
Example
With a little forethought, we could have avoided the problem.
Con un poco de previsión, podríamos haber evitado el problema.
C1 adjective /fɪkˈtɪʃəs/

fictitious

ficticio, falso
Meaning
not real or true; imaginary or fabricated
Example
The story he told was entirely fictitious.
La historia que contó era completamente ficticia.
C1 noun /fɪˈnænʃɪər/

financier

financista
Meaning
a person who manages large amounts of money or investments
Example
The financier advised the company on its investments.
El financista asesoró a la empresa sobre sus inversiones.
C1 adjective /ˈflaʊəri/

flowery

florido / ornamentado
Meaning
Full of flowers or overly elaborate in style or language.
Example
She wrote a flowery letter filled with poetic phrases.
Ella escribió una carta florida llena de frases poéticas.
C1 noun ˌfɜːr.tɪ.laɪˈzeɪ.ʃən

fertilization

fertilización
Meaning
The process of adding nutrients to soil to increase crop productivity.
Example
Organic fertilization enhances soil health.
La fertilización orgánica mejora la salud del suelo.
C1 noun /ˈfɔːrwɜːrd/

foreword

prólogo
Meaning
a short introduction at the beginning of a book, typically written by someone other than the author
Example
The foreword of the book was written by a famous historian.
El prólogo del libro fue escrito por un historiador famoso.
C1 noun /ˈfjuː.də.lɪ.zəm/

feudalism

feudalismo
Meaning
the social system in medieval Europe in which people worked and fought for nobles who gave them protection and land in return
Example
Feudalism shaped the political structure of medieval Europe.
El feudalismo moldeó la estructura política de la Europa medieval.
C1 noun/verb /ˈfʌrəʊ/

furrow

surco
Meaning
A long narrow trench made in the ground by a plow; to make wrinkles or grooves.
Example
The farmer plowed furrows in the field.
El agricultor hizo surcos en el campo.
C1 noun fluˈɪd.ɪ.ti

fluidity

fluididez
Meaning
The ability of a substance to flow easily; smooth and graceful movement or style.
Example
The fluidity of the dancer's movements was mesmerizing.
La fluididez de los movimientos de la bailarina era hipnotizante.
C1 verb /ˈflɪk.ər/

flicker

parpadear
Meaning
to shine unsteadily or waver between light and dark
Example
The candle flickered in the wind.
La vela parpadeaba en el viento.
C1 adjective, adverb (informal, vulgar) /ˈfʌkɪŋ/

fucking

maldito (palabra vulgar para énfasis)
Meaning
used for emphasis, often expressing anger or frustration (vulgar slang)
Example
It was a fucking disaster!
¡Fue un maldito desastre!
C1 adjective /ˈfɛrəl/

feral

salvaje
Meaning
existing in a wild or untamed state; not domesticated
Example
The feral cat roamed the streets at night.
El gato salvaje rondaba por las calles por la noche.
C1 verb /ˈfæbrɪkeɪt/

fabricate

fabricar
Meaning
to invent or concoct something, often with the intent to deceive; or to construct or manufacture
Example
The witness fabricated his testimony to protect himself.
El testigo fabricó su testimonio para protegerse.
C1 noun ˌfræɡ.mənˈteɪ.ʃən

fragmentation

fragmentación
Meaning
The process or state of breaking or being broken into fragments.
Example
Habitat fragmentation threatens many species.
La fragmentación del hábitat amenaza a muchas especies.
C1 noun /fruˈɪʃən/

fruition

cumplimiento
Meaning
The realization or fulfillment of a plan, project, or desire.
Example
Her dream of becoming a doctor finally came to fruition.
El sueño de convertirse en doctora finalmente se hizo realidad.
C1 noun /fɪlθ/

filth

suciedad
Meaning
dirty or disgusting matter; moral corruption
Example
The streets were full of filth after the storm.
Las calles estaban llenas de suciedad después de la tormenta.
C1 adjective/noun /fəˈrɛns.ɪk/

forensic

Análisis científico aplicado a asuntos criminales o legales
Meaning
Scientific analysis applied to criminal or legal matters
Example
Forensic experts analyze cybercrimes using advanced tools.
Los expertos forenses analizan los delitos cibernéticos utilizando herramientas avanzadas.
C1 adjective /ˈfɪɡərətɪv/

figurative

figurado
Meaning
not literal; using figures of speech or symbolic representation
Example
She used figurative language to describe her feelings.
Ella usó lenguaje figurado para describir sus sentimientos.
C1 verb /ˈfɔːltər/

falter

vacilar o perder fuerza o impulso
Meaning
to hesitate or lose strength or momentum
Example
Her voice faltered as she delivered the speech.
Su voz vaciló mientras pronunciaba el discurso.
C1 adjective + noun ˈfeɪvərəbəl klaɪˈmætɪk kənˈdɪʃənz

favorable climatic conditions

condiciones climáticas favorables
Meaning
Weather conditions that are suitable and beneficial for growth or development
Example
Winter offers favorable climatic conditions for farming.
El invierno ofrece condiciones climáticas favorables para la agricultura.
C1 verb /flɔːnt/

flaunt

presumir
Meaning
to show off something proudly, often to attract attention
Example
She likes to flaunt her new jewelry at parties.
A ella le gusta presumir sus nuevas joyas en las fiestas.
C1 verb /feɪn/

feign

fingir, simular
Meaning
to pretend or fake; to give a false appearance of
Example
She feigned illness to avoid going to work.
Ella fingió estar enferma para evitar ir a trabajar.
C1 noun /ˈfɔːrˌbɛərz/

forebears

antepasados
Meaning
Ancestors or people in previous generations from whom one is descended.
Example
We must honor the traditions of our forebears.
Debemos honrar las tradiciones de nuestros antepasados.
C1 noun /fəˈtæləti/

fatality

fatalidad
Meaning
An occurrence of death by accident, disaster, or violence.
Example
The accident resulted in one fatality.
El accidente resultó en una fatalidad.
C1 noun /ˈfɛləni/

felony

delito grave
Meaning
a serious crime, usually punishable by imprisonment for more than one year
Example
He was convicted of a felony and sentenced to ten years in prison.
Fue condenado por un delito grave y sentenciado a diez años de prisión.
C1 adjective /ˈfeɪl.seɪf/

fail-safe

antifallo
Meaning
designed to prevent failure or accidents; guaranteed to work correctly
Example
The engineers installed a fail-safe mechanism in the nuclear plant.
Los ingenieros instalaron un mecanismo antifallo en la planta nuclear.
C1 adjective /ˈfrɛn.zid/

frenzied

frenético
Meaning
Wildly excited or uncontrolled
Example
The frenzied crowd cheered as the band took the stage.
La multitud frenética vitoreó cuando la banda subió al escenario.
C1 noun /flæt fɪʃ/

Flat fish

pez plano
Meaning
a type of fish with a flattened body that lives on the sea floor
Example
Flat fish like sole and flounder are excellent for grilling.
Los peces planos como el lenguado y el platija son excelentes para asar a la parrilla.
C1 adjective /ˈfiːzəbl/

feasible

factible
Meaning
possible to do easily or conveniently; practical and workable
Example
It is feasible to complete the project within two months.
Es factible completar el proyecto dentro de dos meses.
C1 adjective ˈflʌd proʊn

flood-prone

propenso a inundaciones
Meaning
Susceptible to flooding; likely to experience floods frequently.
Example
Bangladesh is a flood-prone deltaic nation.
Bangladesh es una nación deltaica propensa a inundaciones.
C1 verb /ˈfɪdʒɪt/

fidget

moverse inquieto, estar inquieto
Meaning
to make small movements, especially because of nervousness or impatience
Example
The child began to fidget during the long lecture.
El niño empezó a moverse durante la larga conferencia.
C1 noun fɔːlt ˈtɒl.ər.əns

fault-tolerance

tolerancia a fallos
Meaning
The ability of a system to continue operating properly in the event of the failure of some of its components.
Example
Fault-tolerance ensures dependable systems.
La tolerancia a fallos asegura sistemas confiables.
C1 adjective /ˈfrɪvələs/

frivolous

frívolo
Meaning
Not having any serious purpose or value; silly or unimportant.
Example
She dismissed the frivolous complaint quickly.
Ella desestimó la queja frívola rápidamente.
C1 noun ˈflɔː.rə ænd ˈfɔː.nə

flora and fauna

flora y fauna
Meaning
The plants and animals of a particular region, habitat, or geological period.
Example
The Galápagos Islands have unique flora and fauna.
Las Islas Galápagos tienen una flora y fauna únicas.
C1 adjective /ˈfɪs.kəl/

fiscal

fiscal
Meaning
Relating to government revenue, especially taxes, or public money management.
Example
The government introduced new fiscal policies to control inflation.
El gobierno introdujo nuevas políticas fiscales para controlar la inflación.
C1 noun /fəˈnætɪsɪzəm/

fanaticism

fanatismo
Meaning
the quality of being fanatical; extreme zeal or obsession
Example
Religious fanaticism can lead to intolerance and conflict.
El fanatismo religioso puede llevar a la intolerancia y al conflicto.
C1 noun/verb /freɪ/

fray

pelea, desgastarse
Meaning
As a noun, a fight or heated dispute; as a verb, to unravel or wear out through friction.
Example
He tried to stay calm, but his nerves began to fray during the argument.
Trató de mantenerse calmado, pero sus nervios empezaron a desgastarse durante la discusión.
C1 adjective /ˈfrɪdʒɪd/

Frigid

frío; helado
Meaning
extremely cold; freezing; icy
Example
The frigid weather made it difficult to go outside.
El clima frío dificultó salir afuera.
C1 noun /ˈfɔːrˌfɑːðər/

forefather

antepasado
Meaning
an ancestor, especially one who was part of an earlier generation of a family or nation
Example
Our forefathers fought for independence.
Nuestros antepasados lucharon por la independencia.
C1 noun /flʌks/

flux

flujo
Meaning
continuous change or movement; the rate of flow of something
Example
The company was in a state of constant flux during the reorganization.
La empresa estaba en un estado de flujo constante durante la reorganización.
C1 noun /ˈfɪʃˌmʌŋ.ɡər/

fishmonger

pescadero
Meaning
a person or store that sells fish
Example
I bought fresh salmon from the local fishmonger.
Compré salmón fresco del pescadero local.
C1 adjective /ˈfrɔːdjʊlənt/

fraudulent

fraudulento
Meaning
Involving or using deceit, especially criminal deception.
Example
He was arrested for making fraudulent insurance claims.
Él fue arrestado por hacer reclamaciones fraudulentas de seguros.
C1 noun /frɪndʒ/

fringe

borde decorativo / orilla
Meaning
A decorative border of threads; the outer edge or margin of something.
Example
The festival had a fringe of small independent performances.
El festival tenía un borde de pequeñas actuaciones independientes.
C1 noun /ˈfoʊ.kəs ˈtræk.ɪŋ/

focus tracking

seguimiento del enfoque
Meaning
A technique of monitoring and maintaining attention on specific tasks or goals.
Example
Proper focus tracking improves productivity.
Un seguimiento adecuado del enfoque mejora la productividad.
C1 verb /ˈfɔːrfɪt/

forfeit

perder, renunciar como penalización
Meaning
to lose or give up something, usually as a penalty for wrongdoing
Example
He had to forfeit the match after breaking the rules.
Tuvo que perder el partido después de romper las reglas.
C1 verb /fɔrˈstɔl/

forestall

prevenir de antemano
Meaning
to prevent by acting in advance; to anticipate and counter
Example
They forestalled the crisis by taking immediate action.
Ellos evitaron la crisis tomando acción inmediata.
C1 noun /ˈfɔːrɡraʊnd/

foreground

primer plano
Meaning
the part of a scene that is nearest to and in front of the viewer
Example
The flowers in the foreground brightened the picture.
Las flores en el primer plano iluminaron la imagen.
C1 noun/adjective /fɔːrˈboʊdɪŋ/

foreboding

presagio ominoso
Meaning
A feeling that something bad will happen; ominous.
Example
She felt a deep sense of foreboding as she entered the abandoned house.
Ella sintió una profunda sensación de presagio ominoso al entrar en la casa abandonada.
C1 verb ˈflʌk.tʃu.eɪt

fluctuate

fluctuar
Meaning
To regularly increase or decrease.
Example
Stock prices fluctuate due to market conditions.
Los precios de las acciones fluctúan debido a las condiciones del mercado.
C1 noun /fjuːd/

feud

disputa, enemistad
Meaning
a prolonged and bitter quarrel or conflict, often between families or groups
Example
The two families have been in a feud for generations.
Las dos familias han estado en una disputa durante generaciones.
C1 noun /ˈfren.zi/

Frenzy

frenesí
Meaning
a state or period of uncontrolled excitement or wild behavior; intense activity
Example
The announcement of the sale created a shopping frenzy at the mall.
El anuncio de la venta creó una locura de compras en el centro comercial.
C1 noun/verb /fliːs/

fleece

lana de oveja
Meaning
The woolly covering of a sheep; as a verb, to swindle or cheat someone.
Example
The farmer sheared the sheep’s fleece carefully.
El granjero esquiló el vellón de la oveja cuidadosamente.
C1 verb /fɔːˈbɛər/

forbear

abstenerse
Meaning
To refrain from doing something; to show patience or self-control.
Example
She forbore from commenting on his mistake.
Ella se abstuvo de comentar sobre su error.
C1 adjective /ˈfleɪɡrənt/

flagrant

escandaloso y claramente erróneo
Meaning
shockingly noticeable or evident; glaringly wrong
Example
It was a flagrant violation of the rules.
Fue una clara violación de las reglas.
C1 noun, verb /ˈfɜːrloʊ/

furlough

licencia temporal
Meaning
temporary leave of absence from work, especially that granted to an employee or soldier
Example
Many workers were placed on furlough during the crisis.
Muchos trabajadores fueron puestos en furlough durante la crisis.
C1 noun /faɪˈnælɪti/

finality

finalidad
Meaning
the quality of being final or irreversible; a sense of conclusiveness
Example
The judge's decision gave the case a sense of finality.
La decisión del juez le dio al caso una sensación de finalidad.
C1 noun /ˈfænsiər/

fancier

aficionado
Meaning
a person who has a special interest in a particular thing or activity, especially animals or hobbies
Example
He is a fancier of rare birds.
Él es un aficionado a las aves raras.
C1 noun /ˈfɔːrdʒər/

forger

falsificador
Meaning
a person who makes fake documents, artworks, or signatures
Example
The police arrested a forger who had been selling counterfeit paintings.
La policía arrestó a un falsificador que había estado vendiendo pinturas falsas.
C1 noun /ˈfiːtəs/

fetus

feto
Meaning
an unborn or unhatched offspring in the womb or egg
Example
The doctor explained the development of the fetus during pregnancy.
El doctor explicó el desarrollo del feto durante el embarazo.
C1 adjective /ˈfɔːrθˌraɪt/

forthright

directo
Meaning
Direct and honest in speech or behavior; straightforward.
Example
She was forthright in her criticism of the policy.
Ella fue directa en su crítica a la política.
C1 noun/adjective ˈflɛdʒ.lɪŋ

fledgling

principiante, inexperto, recién establecido
Meaning
New, inexperienced, newly established.
Example
The fledgling startup needs investment.
La empresa principiante necesita inversión.
C1 noun /ˈfɔː.nə/

fauna

la vida animal de una región específica
Meaning
The animal life of a particular region, habitat, or geological period.
Example
The fauna of the African savannah includes lions and elephants.
La fauna de la sabana africana incluye leones y elefantes.
C1 adjective /ˈflæɡɪŋ/

flagging

decaer, agotarse o perder entusiasmo
Meaning
becoming tired, weaker, or less enthusiastic
Example
After hours of work, his energy was flagging.
Después de horas de trabajo, su energía estaba disminuyendo.
C1 noun /ˈfɪɡjərˌhɛd/

figurehead

cabeza simbólica
Meaning
a nominal leader with no real power; a symbolic head
Example
The king was merely a figurehead with no real authority.
El rey era simplemente un líder simbólico sin poder real.
C1 adjective /ˈfæn.sɪ.fəl/

fanciful

fantasioso, irreal
Meaning
overimaginative, unrealistic, or whimsical
Example
The story was too fanciful to be true.
La historia era demasiado fantasiosa para ser cierta.
C1 noun ˈfæl.ə.si

fallacy

falacia, error, razonamiento falso
Meaning
False belief, misconception, false reasoning.
Example
The idea that success comes easy is a fallacy.
La idea de que el éxito viene fácil es una falacia.
C1 adjective /ˈfiːlaɪn/

feline

relacionado con los gatos
Meaning
relating to or characteristic of cats
Example
Her movements were graceful and almost feline in their elegance.
Sus movimientos eran gráciles y casi felinos en su elegancia.
C1 noun ˌflʌk.tʃuˈeɪ.ʃən

fluctuation

fluctuación
Meaning
An irregular rising and falling in number or amount; a variation.
Example
The stock market experiences frequent fluctuation.
El mercado de valores experimenta frecuentes fluctuaciones.
C1 verb /ˈflʌtər/

flutter

aletear / temblar
Meaning
to move or flap quickly and lightly; to beat or wave with small rapid motions
Example
The butterfly began to flutter its wings in the sunlight.
La mariposa comenzó a aletear sus alas en la luz del sol.
C1 noun /fəˈrɒs.ə.ti/

ferocity

ferocidad, violencia, intensidad
Meaning
The state or quality of being ferocious; extreme fierceness or violence.
Example
The storm's ferocity was devastating.
La ferocidad de la tormenta fue devastadora.
C1 verb /flɑp/

flop

fracaso
Meaning
to fall or move heavily and clumsily; to fail completely
Example
The new movie flopped at the box office.
La nueva película fracasó en la taquilla.
C1 adjective /ˈfaɪ.naɪt/

Finite

finito; limitado
Meaning
limited; having bounds or limits; not infinite
Example
Earth has finite natural resources.
La Tierra tiene recursos naturales finitos.
C1 verb, noun /ˈflʌstər/

fluster

confundir
Meaning
to make someone agitated or confused
Example
The unexpected question flustered him.
La pregunta inesperada lo confundió.
C1 noun /ˈfɔːrsəm/

foursome

cuatro personas o cosas
Meaning
a group of four people or things, especially in games or social activities
Example
The foursome enjoyed a game of golf together.
El cuarteto disfrutó de un juego de golf juntos.
C1 noun /ˌfɪɡjʊˈriːn/

figurine

pequeña figura decorativa
Meaning
a small ornamental statue or model of a human or animal
Example
She bought a porcelain figurine of a dancing ballerina.
Ella compró una figura de porcelana de una bailarina de ballet.
C1 noun /ˈfræk.tʃər/

Fracture

fractura; rotura de hueso
Meaning
the cracking or breaking of a hard object or material; a break in a bone
Example
The doctor confirmed that he had a hairline fracture in his wrist.
El doctor confirmó que tenía una fractura en la muñeca.
C1 noun /ˌfæb.rɪˈkeɪ.ʃən/

fabrication

invención falsa
Meaning
The invention of false or misleading information; a lie or falsehood.
Example
The article was full of fabrication and misleading claims.
El artículo estaba lleno de invenciones falsas y reclamos engañosos.
C1 noun /fɔːrˈmæl.ə.ti/

Formality

formalidad
Meaning
the rigid observance of rules of convention or etiquette; a thing done simply to comply with requirements
Example
The signing of the contract was just a formality; the deal was already agreed upon.
La firma del contrato fue solo una formalidad; el acuerdo ya estaba acordado.
C1 noun /fæd/

fad

moda pasajera, tendencia
Meaning
a temporary fashion or trend; a short-lived craze
Example
The new diet became a popular fad among teenagers.
La nueva dieta se convirtió en una moda pasajera entre los adolescentes.
C1 adjective /fərˈlɔːrn/

forlorn

desamparado, triste
Meaning
extremely sad, lonely, or abandoned
Example
The abandoned puppy looked so forlorn in the rain.
El cachorro abandonado se veía tan triste bajo la lluvia.
C1 noun /ˈfɛlən/

felon

delincuente
Meaning
a person who has committed a serious crime
Example
The felon was sentenced to ten years in prison.
El delincuente fue sentenciado a diez años de prisión.
C1 noun /ˌfɜːrmənˈteɪʃən/

fermentation

fermentación, cambio químico por levaduras o bacterias
Meaning
a chemical process by which substances like sugar are converted into alcohol or acids using microorganisms
Example
The fermentation of grapes produces wine.
La fermentación de uvas produce vino.
C1 adjective /fəˈnætɪk/

Fanatic

fanático
Meaning
extremely passionate about something; showing excessive enthusiasm or devotion
Example
He is a fanatic supporter of his football team.
Él es un fanático seguidor de su equipo de fútbol.
C1 noun /fɪˈdɛl.ɪ.ti/

fidelity

fidelidad
Meaning
Faithfulness to a person, cause, or belief, demonstrated by continuing loyalty and support.
Example
A dog's fidelity to its owner is unmatched.
La fidelidad de un perro hacia su dueño es incomparable.
C1 noun /fɔːrˈkloʊʒər/

foreclosure

embargo hipotecario
Meaning
The legal process by which a lender takes control of a property from a borrower who has failed to make payments.
Example
The family lost their home due to foreclosure after missing several mortgage payments.
La familia perdió su casa debido al embargo hipotecario después de no pagar varias cuotas de la hipoteca.
C1 noun /ˈflɔː.rə/

flora

la vida vegetal encontrada en una región o hábitat particular
Meaning
The plant life found in a particular region or habitat.
Example
The Amazon rainforest is home to a vast flora diversity.
La selva amazónica es hogar de una gran diversidad de flora.
C1 adjective ˈfæʃ.ɪst

fascist

fascista
Meaning
Relating to or characteristic of fascism; extremely authoritarian.
Example
Fascist governance undermines freedom.
El gobierno fascista socava la libertad.
C1 noun ˌfiː.zəˈbɪl.ə.ti

feasibility

viabilidad
Meaning
The state or degree of being easily or conveniently done; possibility.
Example
The company conducted a feasibility study before launching the project.
La empresa realizó un estudio de viabilidad antes de lanzar el proyecto.
C1 adjective /ˈfeɪt.fəl/

fateful

decisivo o fatal
Meaning
having significant or disastrous consequences
Example
Their fateful decision changed the course of history.
Su decisión decisiva cambió el curso de la historia.